Scar HAMR build

I am looking to make a Scar HAMR builld... For those of you who don't know it is a light machine gun based off of a SCAR. As for the base I was thinking a D-boys/AGM. Also upgrading the necessities (motor,barrel,hopup and nub) externals would be a bi-bod with maybe a forward grip if possible and also a C-mag or the single one? Would these choices be good any suggestions for a diff. Base gun and any other internal/external suggestions, all opinions are welcome!!thanks!